package com.example.san.datepickerdialog;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.view.View;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import android.widget.Button;
import android.widget.DatePicker;
import android.view.View.OnClickListener;
import android.app.DatePickerDialog;
import android.widget.Toast;

public class DialogActivity extends Activity {

    private TextView showdate;
    private Button setdate;
    private int year;
    private int month;
    private int day;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dialog);

        showdate = (TextView) this.findViewById(R.id.showtime);
        setdate = (Button) this.findViewById(R.id.setdate);
        Calendar c = Calendar.getInstance(Locale.CHINA);
        Date mydate = new Date();
        c.setTime(mydate);

        year = c.get(Calendar.YEAR);
        month = c.get(Calendar.MONTH);
        day = c.get(Calendar.DAY_OF_MONTH);
        showdate.setText("当前日期：" + year + "-" + (month + 1) + "-" + day);

        setdate.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                DatePickerDialog my_datePickerDialog = new DatePickerDialog(DialogActivity.this, Datelistener, year, month, day);
                my_datePickerDialog.show();
            }
        });
    }

    private DatePickerDialog.OnDateSetListener Datelistener = new DatePickerDialog.OnDateSetListener() {
        public void onDateSet(DatePicker v, int y, int m, int d) {
            int i;
            if(year > y || (year == y && month > m) || (year == y && month == m && day > d)) {i=1;}
            else {i=0;}
            if(i==1){
                year = y;
                month = m;
                day = d;
                updateDate();
            }
            else if(i==0){
                Toast.makeText(DialogActivity.this,"设置日期无效",Toast.LENGTH_LONG).show();
            }
    }

        private void updateDate() {
            showdate.setText("当前日期：" + year + "-" + (month + 1) + "-" + day);
        }

    };
}
